A man walks into a bar with a monkey he had just bought at the pet store. He sits down at the bar and orders a beer. The monkey jumps down off his shoulder and runs over to the pool table and ate the cue-ball.
The bartender says "Your monkey just ate the cue-ball!!! GET OUT NOW!" so the man picks up the monkey and leaves.
Two months later the same man comes back with the monkey on a leash. The monkey jumps off his shoulder and grabs a peanut, shoves it up his ass, pulls it out then eats it.
The bartender says "Did your monkey just shove a peanut up his ass then eat it?"
The man says "Yeah ever since the cue-ball incident he checks everything for size"